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is a significant concern for physicians. Central
7 |* Q# u2 U% ^precocious puberty (CPP), which is mediated* A" [. U6 @, a0 a
through the hypothalamic pituitary gonadal axis, has
/ I' ]$ K. k1 E" m4 y$ Xa higher incidence of organic central nervous system8 o9 g: Z& J; Q7 I S. v, ]% H+ f
lesions in boys.1,2 Virilization in boys, as manifested
) J A. V. o( iby enlargement of the penis, development of pubic
( Z/ r7 R& B0 W' Yhair, and facial acne without enlargement of testi-. V" [: K$ E' m) f3 b8 r$ p ~
cles, suggests peripheral or pseudopuberty.1-3 We
1 |1 ]- J+ I1 {. ^0 |7 f) l4 areport a 16-month-old boy who presented with the
( M6 O9 u' G! S0 henlargement of the phallus and pubic hair develop-
$ k* g! q+ q; a% ement without testicular enlargement, which was due) K, w" ] m9 u6 D( i0 O
to the unintentional exposure to androgen gel used by
, N( M6 k( y% K8 W5 Y. Y& athe father. The family initially concealed this infor-
% m- F( v. v" B {mation, resulting in an extensive work-up for this8 {1 w8 \1 J% e
child. Given the widespread and easy availability of
; J2 N" T2 I. P. @- T+ d, w+ v( Vtestosterone gel and cream, we believe this is proba-
6 n k, K ~; M% m, _( Rbly more common than the rare case report in the. j$ h+ T2 {' ^# x: q1 v ]& f
literature.4
6 W1 A' e% f% U o" }% UPatient Report) Y& ~7 f+ \* W2 k
A 16-month-old white child was referred to the- |* o0 w- K4 z8 K% y
endocrine clinic by his pediatrician with the concern
- o4 M# H1 f D& ^8 V7 Nof early sexual development. His mother noticed
1 C& x3 p& R/ s, M3 U6 J- Q+ z( Clight colored pubic hair development when he was5 ? ^ T0 D. w5 k
From the 1Division of Pediatric Endocrinology, 2University of
- t$ Q" L4 m9 m7 n' fSouth Alabama Medical Center, Mobile, Alabama.# K2 d$ b, T" z
Address correspondence to: Samar K. Bhowmick, MD, FACE,
1 P- T1 A: H, KProfessor of Pediatrics, University of South Alabama, College of
/ [- U6 ?! ^' x) O0 X5 l+ K, m VMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;" z* |# `2 F& \" x7 l" y
e-mail: [email protected].
, z2 N& J8 y, `7 `8 i& |about 6 to 7 months old, which progressively became
: C6 [0 y6 W: C+ Pdarker. She was also concerned about the enlarge-
' w8 }" M" w; d- `# Z ^. ?$ Gment of his penis and frequent erections. The child+ A0 I+ c# M! N9 M* Q( e
was the product of a full-term normal delivery, with: ?1 `0 Z" Q) T. M1 Z3 ?
a birth weight of 7 lb 14 oz, and birth length of
& g$ N. _8 |+ D; \20 inches. He was breast-fed throughout the first year6 U4 a6 W# i7 `& o
of life and was still receiving breast milk along with
4 F( S F1 q- c K3 Z$ ?solid food. He had no hospitalizations or surgery,, n' S( \2 K# m% U- L! c
and his psychosocial and psychomotor development
, C) q( e1 y4 C: O- p" k2 e" o, m6 lwas age appropriate.
4 r+ P( i6 f' l5 s1 FThe family history was remarkable for the father,
( w- l; H0 F4 C* W4 lwho was diagnosed with hypothyroidism at age 16,4 `- J% P6 l& W0 P5 V
which was treated with thyroxine. The father’s
! U5 y2 D$ T/ a6 d: yheight was 6 feet, and he went through a somewhat
2 x; \4 R, r; A2 M0 kearly puberty and had stopped growing by age 14.
5 o: }* d, I5 j& r/ [/ c2 `The father denied taking any other medication. The2 f4 k o$ x( \' `! S+ {1 a) N
child’s mother was in good health. Her menarche' T' K5 K1 ~4 n! O; K
was at 11 years of age, and her height was at 5 feet
9 k! `+ G7 q0 R8 X/ I! d$ c. U5 inches. There was no other family history of pre-2 m8 M# z. s- M5 i4 _* {, R
cocious sexual development in the first-degree rela-! C* J) ]* ~) }* g4 r* w5 }3 z
tives. There were no siblings.
5 S4 v3 y# [6 Y6 [" W$ hPhysical Examination, A2 \4 m" q2 J9 Q4 q
The physical examination revealed a very active,
3 |: `: j: g* e. a1 f9 x0 ?playful, and healthy boy. The vital signs documented
/ y7 ^ f' D& ]+ h8 i6 ~% Ha blood pressure of 85/50 mm Hg, his length was- e" j Y0 C& a$ o5 }( `/ I
90 cm (>97th percentile), and his weight was 14.4 kg
4 ^' `! f# X' b6 ~4 K4 ?! ]' k. X(also >97th percentile). The observed yearly growth* z* Y& z% j; d( O- R! g
velocity was 30 cm (12 inches). The examination of
H1 Y- v6 V& I {/ D* [/ dthe neck revealed no thyroid enlargement.
1 F$ H, y! [3 ^6 H9 gThe genitourinary examination was remarkable for
) K% N5 Q& Z0 Z: z% @) Ienlargement of the penis, with a stretched length of0 O+ a- Y) Q8 r w8 m
8 cm and a width of 2 cm. The glans penis was very well/ _2 V4 Y- A' p8 ^& j
developed. The pubic hair was Tanner II, mostly around
* s0 w# d1 d0 s$ g540
+ s/ a' v: S. h$ C/ u4 Bat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from$ _# ]# E; [7 E, D4 V
the base of the phallus and was dark and curled. The
2 l5 ^, q# A7 [4 b1 Otesticular volume was prepubertal at 2 mL each./ j! O, S% a$ V7 K" M; d
The skin was moist and smooth and somewhat
2 V- ]6 i3 C. `1 P2 u9 Boily. No axillary hair was noted. There were no
2 K+ @1 l1 \$ r/ k. O8 c4 f4 Uabnormal skin pigmentations or café-au-lait spots.# v9 F7 p; f% Q+ U
Neurologic evaluation showed deep tendon reflex 2+
2 g% }. K( i6 c5 g+ zbilateral and symmetrical. There was no suggestion
# }9 F; R* _ uof papilledema.8 e8 j Z. u3 W# v& l% y. |
Laboratory Evaluation i3 C1 r; }4 W
The bone age was consistent with 28 months by
D( V3 ?! M4 j P r0 h; D9 b# eusing the standard of Greulich and Pyle at a chrono-: U$ K" V2 p3 T* W" D U, A
logic age of 16 months (advanced).5 Chromosomal
; b5 O0 t3 t9 _5 ^5 skaryotype was 46XY. The thyroid function test$ [5 V3 E$ s; f' e+ C
showed a free T4 of 1.69 ng/dL, and thyroid stimu-, c5 h% m; r1 k2 `
lating hormone level was 1.3 µIU/mL (both normal).
, |9 C1 L, z2 j* H4 V. j5 ?3 oThe concentrations of serum electrolytes, blood
6 R: P5 V, J: z8 [urea nitrogen, creatinine, and calcium all were
5 J# r) r5 ~8 P1 Zwithin normal range for his age. The concentration
* [% v4 k7 n# O7 Dof serum 17-hydroxyprogesterone was 16 ng/dL
7 W5 K8 ]8 R! |(normal, 3 to 90 ng/dL), androstenedione was 20
8 {" Z! ]* t* S; Dng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
3 s# t) L3 \9 ]* F; wterone was 38 ng/dL (normal, 50 to 760 ng/dL),/ @. O3 V1 P1 L
desoxycorticosterone was 4.3 ng/dL (normal, 7 to: W: M j/ s% J
49ng/dL), 11-desoxycortisol (specific compound S)) h% I. b& m; `
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-+ `+ A4 ?3 n% Y6 S# d2 C
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total8 A0 t9 ~: Z% t1 v0 q
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),' r3 Z" C) T' A1 a+ i
and β-human chorionic gonadotropin was less than
- `2 h4 {6 @( N% q2 i6 C0 D5 mIU/mL (normal <5 mIU/mL). Serum follicular+ L9 x; G& L3 ]2 K% h5 y! @
stimulating hormone and leuteinizing hormone
; ^5 |+ \+ w4 s Rconcentrations were less than 0.05 mIU/mL
1 N3 `) R; \9 T' m/ U(prepubertal).
; B& R; O/ R1 s9 y8 s& u6 xThe parents were notified about the laboratory
- L0 g0 P6 b, Q3 v. z* g) V; Uresults and were informed that all of the tests were, s) z M% [5 V9 M4 d; P
normal except the testosterone level was high. The7 p' I% ?" V. j
follow-up visit was arranged within a few weeks to
0 v8 i! g7 i4 w9 @/ t% vobtain testicular and abdominal sonograms; how-/ i9 f {9 K% R: v% y6 g
ever, the family did not return for 4 months.
8 L3 O2 P/ J9 I; @4 Q aPhysical examination at this time revealed that the
# q4 u4 h* e- T2 Z6 @4 L+ kchild had grown 2.5 cm in 4 months and had gained
) d, M! {0 I$ E4 |5 |& T2 kg of weight. Physical examination remained
6 Z+ B1 ~( _$ D$ Q6 Runchanged. Surprisingly, the pubic hair almost com-
- O4 O# m; }- ^: {* Y" Rpletely disappeared except for a few vellous hairs at
; z- s/ \0 q8 ]$ rthe base of the phallus. Testicular volume was still 2
. j9 R/ @ v0 kmL, and the size of the penis remained unchanged.
: [& z$ M2 Z" e# E- ^8 aThe mother also said that the boy was no longer hav-
: F5 u" a" ~3 P" z1 \7 h1 Jing frequent erections.
: C9 B4 S# Z& m9 U- r5 c/ P$ iBoth parents were again questioned about use of
9 K% y3 m- d9 u( h1 ^any ointment/creams that they may have applied to
! O4 A3 `1 x4 j t, L9 j+ e+ A% gthe child’s skin. This time the father admitted the
. ~1 f6 ?( Y) n9 ATopical Testosterone Exposure / Bhowmick et al 541
0 ]. G1 e4 B) `# B$ I. C: Y0 Buse of testosterone gel twice daily that he was apply-5 x6 T$ H" k& g; y8 @( i
ing over his own shoulders, chest, and back area for
, A' j }1 T& N. q" t1 v4 ^5 ]+ ra year. The father also revealed he was embarrassed
) n1 O& K7 ^6 z1 r ito disclose that he was using a testosterone gel pre-, q" X1 G' N+ R/ Q+ y' z
scribed by his family physician for decreased libido
- ^# k: K. J* o! Rsecondary to depression.( X, V6 n# U: f( I
The child slept in the same bed with parents.
/ G, y' Z) N. ?& W" y6 o4 MThe father would hug the baby and hold him on his
9 b. f D7 c! Y3 i: gchest for a considerable period of time, causing sig-/ w# ^# @, W! l& c/ j
nificant bare skin contact between baby and father.
$ f& I" n3 s2 N) {# FThe father also admitted that after the phone call,0 q- w" y' U! ~7 I
when he learned the testosterone level in the baby
* S! ~8 H' v; a( t! d- U; G: zwas high, he then read the product information
8 @- b, X( I5 A9 q6 `# g! Jpacket and concluded that it was most likely the rea-
0 N6 y1 A% K8 o/ oson for the child’s virilization. At that time, they
, t1 ^' i$ @4 p2 h! q! \$ ^' ~decided to put the baby in a separate bed, and the8 V9 x0 C) k4 I
father was not hugging him with bare skin and had
) }: G2 H* o& Lbeen using protective clothing. A repeat testosterone
: R) `0 _9 x) `; M6 Z) g% Vtest was ordered, but the family did not go to the# s9 x' |7 R5 L0 C4 |
laboratory to obtain the test.# n# g3 |; D0 G2 ?( |$ O: l( L
Discussion, J- F7 T: O& V* Z% P
Precocious puberty in boys is defined as secondary
W0 v" a( `5 a. K% s) D) G# Msexual development before 9 years of age.1,4
] s# U9 y" s# I5 K* KPrecocious puberty is termed as central (true) when( K% v# h( j W4 G3 c, } J9 J( ^
it is caused by the premature activation of hypo-9 ~7 t$ m5 A7 F$ j$ l$ E P
thalamic pituitary gonadal axis. CPP is more com-* K0 n5 q, T. t; w {
mon in girls than in boys.1,3 Most boys with CPP
. C( `3 K8 K0 w1 \ @may have a central nervous system lesion that is5 M; d/ k! \8 Y3 k( s
responsible for the early activation of the hypothal-" }& o- A) z7 V! L
amic pituitary gonadal axis.1-3 Thus, greater empha-7 |& @( g) L, I% m- P4 x
sis has been given to neuroradiologic imaging in
5 F, Y/ K5 A( L' g- q" G7 xboys with precocious puberty. In addition to viril-
% h; D ~8 K& Eization, the clinical hallmark of CPP is the symmet-- p" E( N1 O0 N5 s0 w
rical testicular growth secondary to stimulation by( t" ^( s9 A6 N4 w) X" Z
gonadotropins.1,3, _, h% n& u& D6 O2 }% ~2 Y( K4 V
Gonadotropin-independent peripheral preco-7 @. l) |! ?- @/ b7 n* L4 e
cious puberty in boys also results from inappropriate
; j; f* x$ x9 N, C! b# kandrogenic stimulation from either endogenous or
0 f% U& f/ T6 _" p% z* _- iexogenous sources, nonpituitary gonadotropin stim-
$ A5 ~* r/ i; o' I0 f9 C) Mulation, and rare activating mutations.3 Virilizing
4 o, `% n/ @9 i- acongenital adrenal hyperplasia producing excessive F9 @ c. {% R( J6 w- L3 s, I
adrenal androgens is a common cause of precocious
! S0 }2 @* |! Y% G5 Upuberty in boys.3,4
: G9 G$ T+ E. K: l. DThe most common form of congenital adrenal
) d' {- V6 b3 p# { W$ Thyperplasia is the 21-hydroxylase enzyme deficiency.3 X+ A/ G# w9 a' O* K M: ?" R# q
The 11-β hydroxylase deficiency may also result in: O2 V9 B2 j! _. F/ S
excessive adrenal androgen production, and rarely,
" s7 k# ~: y) \% R+ q% can adrenal tumor may also cause adrenal androgen
+ G1 L! Z1 P" u( ?, @excess.1,33 L9 @* m# S' {/ s# @, B7 \
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from1 X1 B/ B% k% K# o: {9 v$ ~
542 Clinical Pediatrics / Vol. 46, No. 6, July 20076 ]& ]0 x9 j4 d J2 g/ k
A unique entity of male-limited gonadotropin-) L p0 S6 w5 h$ R. b+ i! w5 e
independent precocious puberty, which is also known$ @' C7 y) M& L& m, ~$ }$ N
as testotoxicosis, may cause precocious puberty at a
1 m! f0 ^9 j9 N: ?: R! p, Xvery young age. The physical findings in these boys/ ]1 Z4 X, K# Y
with this disorder are full pubertal development,
. C! ]6 X& ]8 uincluding bilateral testicular growth, similar to boys8 K$ U( i8 n4 c6 L$ h
with CPP. The gonadotropin levels in this disorder5 G9 O8 y" P: S& t8 j/ p8 j! L
are suppressed to prepubertal levels and do not show" N/ U# b( u+ ^4 [5 h% `& N
pubertal response of gonadotropin after gonadotropin-4 o! }, e# ?/ X% _1 \
releasing hormone stimulation. This is a sex-linked/ Y$ ^+ V1 C8 J ?
autosomal dominant disorder that affects only
) n5 N# F" V Y" e% n s& nmales; therefore, other male members of the family
" k$ C0 O8 m1 F1 g4 P: b, R2 B( r! ?may have similar precocious puberty.3
/ u6 ~ T8 y8 V/ q2 nIn our patient, physical examination was incon-! O! } W+ q+ D' Q- T
sistent with true precocious puberty since his testi-8 @7 L* i' t S
cles were prepubertal in size. However, testotoxicosis0 C/ J- P: E1 Z4 F# a, p% C) W! v
was in the differential diagnosis because his father" \2 ?7 Z2 T1 R9 r+ J) ^1 A5 c6 S
started puberty somewhat early, and occasionally,4 a4 R6 D- _# z& Y" V7 b2 h
testicular enlargement is not that evident in the) D: X3 U5 J/ S9 v# u% a
beginning of this process.1 In the absence of a neg-& q8 s( \7 P3 C/ ]* T* k
ative initial history of androgen exposure, our6 d# \! l: u9 F) [; ~6 I5 E- d
biggest concern was virilizing adrenal hyperplasia,
% j; D8 H$ |0 p. \8 Deither 21-hydroxylase deficiency or 11-β hydroxylase
! f o. `' N9 ^. }deficiency. Those diagnoses were excluded by find-$ c' D) V' G) b: e- a
ing the normal level of adrenal steroids.
& o* s. F, J6 d! k0 F7 H5 ]The diagnosis of exogenous androgens was strongly' n$ k3 p2 V7 f# U
suspected in a follow-up visit after 4 months because2 U5 V9 t Z9 T
the physical examination revealed the complete disap-# j! a& I% k! j1 ^+ Z; a. f
pearance of pubic hair, normal growth velocity, and/ g, s6 R5 s- U/ ~9 v
decreased erections. The father admitted using a testos-
" N$ C8 X* m& @3 ^terone gel, which he concealed at first visit. He was
( t+ i+ {1 w- L! @: Dusing it rather frequently, twice a day. The Physicians’
7 w; ]# |, O4 h8 `3 sDesk Reference, or package insert of this product, gel or' i, n/ I- m& t6 S
cream, cautions about dermal testosterone transfer to6 c8 q3 N) ~" F
unprotected females through direct skin exposure.$ X f3 j Q0 O5 E2 o
Serum testosterone level was found to be 2 times the. m) K4 I% g2 Z2 W
baseline value in those females who were exposed to5 L; { b* A7 z$ Q# A! Q* k
even 15 minutes of direct skin contact with their male
* K8 M. U- P) i3 S8 D7 V. vpartners.6 However, when a shirt covered the applica-
1 B) M; ^# n, N- ?* {3 ytion site, this testosterone transfer was prevented.
7 X( N: ~4 |0 X# ~ NOur patient’s testosterone level was 60 ng/mL,2 o/ {8 ^' \$ j
which was clearly high. Some studies suggest that
9 x) @+ {5 i0 cdermal conversion of testosterone to dihydrotestos-
2 f, F% s1 }5 b2 T, l# n8 R5 U" i3 A1 [terone, which is a more potent metabolite, is more4 E5 u$ x1 z. }/ y# k- b, f6 ~7 [
active in young children exposed to testosterone2 V) v5 u3 T4 x$ ^4 a9 T8 {, C
exogenously7; however, we did not measure a dihy-
; E) ^7 [" t, `+ ~+ j& pdrotestosterone level in our patient. In addition to
. X6 i+ }5 _+ g8 Cvirilization, exposure to exogenous testosterone in& w4 Y& c- h2 y1 D- s
children results in an increase in growth velocity and; t5 v: L) F) X, a9 ?
advanced bone age, as seen in our patient.
5 c) _6 l4 }8 E; y2 C" MThe long-term effect of androgen exposure during
3 Q& A/ r0 Y+ i' _early childhood on pubertal development and final/ ?8 e2 b3 @) i0 }/ N4 l! l
adult height are not fully known and always remain; Y& G- V; u+ X' p
a concern. Children treated with short-term testos-# i- P- E1 p! b! v# h+ g3 T' i" y
terone injection or topical androgen may exhibit some
2 g+ L; \! x+ Y: O( aacceleration of the skeletal maturation; however, after
" B$ o5 B2 P* ?& kcessation of treatment, the rate of bone maturation
3 t3 e! }2 M# s! Rdecelerates and gradually returns to normal.8,9- i& ?8 P% ]. j9 v/ ~+ c
There are conflicting reports and controversy
/ ^8 G2 _/ g9 h7 a4 Yover the effect of early androgen exposure on adult
3 M: Z( W! H0 D# O( upenile length.10,11 Some reports suggest subnormal& M. @6 G" b2 A8 g+ ^9 K
adult penile length, apparently because of downreg-
# W; [; ~( [% ~0 y: iulation of androgen receptor number.10,12 However,
. F0 C9 o v; k: u0 _$ @$ \. j/ Z, ISutherland et al13 did not find a correlation between8 c4 x8 e" u- r1 c! d, p. u& l( j. i
childhood testosterone exposure and reduced adult
5 G. E* R" N+ tpenile length in clinical studies.
6 b* v8 V( o$ C( FNonetheless, we do not believe our patient is
: ]9 I& V9 o, O+ w- Igoing to experience any of the untoward effects from
! k# ]' U* z$ _) h6 k/ e- z) ptestosterone exposure as mentioned earlier because
, O* ?6 `/ n8 U* x \the exposure was not for a prolonged period of time.
Q8 P+ |* _' H: z3 _7 j- L, d/ W. c nAlthough the bone age was advanced at the time of E% x8 e( D g. k4 n$ Y5 W+ F
diagnosis, the child had a normal growth velocity at% G! C8 G; ]7 [% y- t2 |( ^
the follow-up visit. It is hoped that his final adult/ l! v/ K7 j: N3 O' ?
height will not be affected.
8 M" I3 g, H9 Y8 E! m l1 ^Although rarely reported, the widespread avail-
; {' e# F' Z! Q+ U7 l* Jability of androgen products in our society may
, G$ M9 y( e$ Z0 Y2 Bindeed cause more virilization in male or female
! G. [9 k2 y9 C2 g) ~( B7 zchildren than one would realize. Exposure to andro-4 x3 j! q1 D1 g' Y2 H/ \! v
gen products must be considered and specific ques-/ Q; S, o$ W: j* r
tioning about the use of a testosterone product or, k; A- B, e. t) G6 {3 F
gel should be asked of the family members during
% q7 r" s7 n& M, f& Dthe evaluation of any children who present with vir-7 {2 K {1 _ `
ilization or peripheral precocious puberty. The diag-
8 X2 H c2 P1 C: {nosis can be established by just a few tests and by
4 e: Y8 O0 \" y; z% @% Bappropriate history. The inability to obtain such a
6 C# g8 E+ G k: {: thistory, or failure to ask the specific questions, may6 |3 B+ [& I) a; C8 g( w6 G0 i
result in extensive, unnecessary, and expensive
8 v: M/ \/ k V6 c) p6 o# U: jinvestigation. The primary care physician should be6 a8 r3 A( K7 _: n
aware of this fact, because most of these children
, j# t: N1 D2 a; Q7 C& G1 r* Dmay initially present in their practice. The Physicians’ K, }, }" x: d! P. p0 E$ |9 i" m# H
Desk Reference and package insert should also put a" a5 a% a9 j* c2 U/ F/ X
warning about the virilizing effect on a male or% M/ i8 o# v. e: B
female child who might come in contact with some-
' C; h/ o' j( `0 H' e. Bone using any of these products.5 A7 h; [" l+ T r; c
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8 d# D! \) b. }# Z& z6 aexposure to testosterone. Pediatrics. 1999;104:e23.
# o4 n6 X( y! K2 }6 T7 e _1 s* P5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
$ t! a2 X q/ N4 e2 xSkeletal Development of the Hand and Wrist. 2nd ed.
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- e% `# ]/ a: M" R2 M; w6. Physicians’ Desk Reference. Androgel 1% testosterone,
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7. Klugo RC, Cerny JC. Response of micropenis to topical
! s: N0 P" {/ jtestosterone and gonadotropin. J Urol. 1978;119:
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