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is a significant concern for physicians. Central$ o# J2 d! d! B' i
precocious puberty (CPP), which is mediated* y9 E" n7 s3 u7 X9 L Z
through the hypothalamic pituitary gonadal axis, has( |9 _: j) a$ A% R. X! g G
a higher incidence of organic central nervous system) u f6 D- P: \' @: h1 w( w
lesions in boys.1,2 Virilization in boys, as manifested
0 l% \& u* x) C* l) a& wby enlargement of the penis, development of pubic
, n% K H* Q& V3 u1 Q: g1 zhair, and facial acne without enlargement of testi-* C' }* p0 {2 j2 W
cles, suggests peripheral or pseudopuberty.1-3 We2 e* y' h7 y- @( V6 q0 j
report a 16-month-old boy who presented with the
% w4 ~. {0 l. J ienlargement of the phallus and pubic hair develop-+ N; e# V" X# g
ment without testicular enlargement, which was due
; Z8 s" e' [; B4 Nto the unintentional exposure to androgen gel used by' a1 i$ y9 b! T
the father. The family initially concealed this infor-
9 Z( S9 O! d$ Q) ]; p" R/ d Qmation, resulting in an extensive work-up for this" D7 z M. B% a5 ^
child. Given the widespread and easy availability of' M2 M! R/ Y/ M5 d5 M7 |/ ?
testosterone gel and cream, we believe this is proba-
3 j1 m/ i- Z# `2 Y9 ^& ?* E+ l6 ybly more common than the rare case report in the
# p b5 z8 Z( {+ gliterature.4
; p. N2 o/ e7 T' a9 S! yPatient Report
. A4 @' N+ ^$ \& f+ R# k7 ]+ }A 16-month-old white child was referred to the" L) {8 E% O: s8 c3 k- `; E; g
endocrine clinic by his pediatrician with the concern) S% b% g0 V, J) L' ^+ Z
of early sexual development. His mother noticed Y6 u7 J, M) f5 H% q
light colored pubic hair development when he was
g# o7 b8 W7 n5 r( }5 MFrom the 1Division of Pediatric Endocrinology, 2University of
' B, e% @1 f" W% z. xSouth Alabama Medical Center, Mobile, Alabama.
1 \' _5 }# }2 [7 AAddress correspondence to: Samar K. Bhowmick, MD, FACE,
! p% S% o) l- b3 c; U. z5 u2 RProfessor of Pediatrics, University of South Alabama, College of
# Q5 f# y6 T( j$ P( CMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;: g( O3 M, l( ?
e-mail: [email protected].6 ?0 c2 d& a6 p% ?- c# q
about 6 to 7 months old, which progressively became
8 T, Z3 e. G: v. w0 vdarker. She was also concerned about the enlarge-
) d% i. d. {3 d/ _% }; sment of his penis and frequent erections. The child
6 A- a. ^0 r" Wwas the product of a full-term normal delivery, with
" B4 F2 |1 }# d/ Z. \a birth weight of 7 lb 14 oz, and birth length of
* D% t% I w& ~& [' I20 inches. He was breast-fed throughout the first year
+ F2 `6 C6 h, W3 X; w5 r5 Jof life and was still receiving breast milk along with
( \) Y8 R) Q' x# u7 Y% Fsolid food. He had no hospitalizations or surgery,
) \5 ~( _7 |' l9 [' T) K, Tand his psychosocial and psychomotor development: U1 q* x9 W- z. Q0 u9 e
was age appropriate.
9 H: x' K4 }) |+ ~% {+ c/ mThe family history was remarkable for the father,. N, w% {, \7 \8 q
who was diagnosed with hypothyroidism at age 16,
( o; J- U0 k0 n: ~! J K' F* B. Bwhich was treated with thyroxine. The father’s
' G5 a) d% }+ }4 _* _0 N/ ]height was 6 feet, and he went through a somewhat6 a2 r0 Y# O9 |0 D/ Z6 V
early puberty and had stopped growing by age 14.
+ r/ D5 U* d1 j4 C- OThe father denied taking any other medication. The
( @8 ?- q6 C- T4 J& S, dchild’s mother was in good health. Her menarche
* [" ^) s. Q }" Wwas at 11 years of age, and her height was at 5 feet
# D# Q+ L6 K! E4 q. s5 inches. There was no other family history of pre-+ `5 m8 u+ U0 ^1 B" f
cocious sexual development in the first-degree rela-
" A# ^! \; e+ f8 ltives. There were no siblings.% v# c, m7 J: b2 }
Physical Examination
: o# e6 t! r( _5 W- G0 LThe physical examination revealed a very active,* v6 ]6 j1 M1 ^
playful, and healthy boy. The vital signs documented
' z1 c8 Z4 y* ~; e% ua blood pressure of 85/50 mm Hg, his length was
/ i/ n+ i/ N M90 cm (>97th percentile), and his weight was 14.4 kg
7 U6 W8 ~7 X8 ]8 l; e(also >97th percentile). The observed yearly growth& ?( e2 r+ A0 O7 n+ F
velocity was 30 cm (12 inches). The examination of
+ P2 K B6 L) |' S6 {the neck revealed no thyroid enlargement.
6 P+ v! P2 o* f* y% `The genitourinary examination was remarkable for: t( o: l$ x, u6 z
enlargement of the penis, with a stretched length of0 Z/ i6 r7 ?5 \
8 cm and a width of 2 cm. The glans penis was very well& p8 @) [8 |/ u/ Y# w% V: L4 k
developed. The pubic hair was Tanner II, mostly around
0 Q8 g" `0 t$ u0 x5401 x4 R& @% X" [: ?" {: M5 m
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
9 h. D [4 t! zthe base of the phallus and was dark and curled. The3 ~& X2 F/ O! ]0 |7 m
testicular volume was prepubertal at 2 mL each.
# D- G$ q" |, r6 n% W3 m& X3 t/ IThe skin was moist and smooth and somewhat
: t/ E. S& u$ G5 e% K$ Noily. No axillary hair was noted. There were no" o" Q" f7 ?4 ~# V4 Z/ Z* ?
abnormal skin pigmentations or café-au-lait spots.
, [- J9 ^2 ? X0 Q+ INeurologic evaluation showed deep tendon reflex 2+
& C: R1 e) s9 [* f0 R* cbilateral and symmetrical. There was no suggestion
% K4 V2 v% F3 C1 G: P4 W/ u; @of papilledema.
. J, n9 T n9 n) \8 K8 J) E; DLaboratory Evaluation; J, j4 ~4 b9 Z, o. W4 F6 `
The bone age was consistent with 28 months by
! f5 T% U$ e( ^+ t" C% Xusing the standard of Greulich and Pyle at a chrono-
/ l z1 t% ~; s4 M; K6 jlogic age of 16 months (advanced).5 Chromosomal
* v$ }3 E& ], r, [$ K6 qkaryotype was 46XY. The thyroid function test4 c0 l' ^/ H) k
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
* V, e, J( S9 Zlating hormone level was 1.3 µIU/mL (both normal).! E, t7 ]! r' K, |( g; b
The concentrations of serum electrolytes, blood
+ T6 N' n4 z5 g% [+ ^ d$ xurea nitrogen, creatinine, and calcium all were
3 ]( e8 H# _# ]" d1 W7 awithin normal range for his age. The concentration
' M: k& z3 R1 c5 z8 V2 ^of serum 17-hydroxyprogesterone was 16 ng/dL3 P: t. q0 _" q
(normal, 3 to 90 ng/dL), androstenedione was 20
/ L8 T$ h& }) }$ |ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-1 Y: h0 E8 m. }& [! R7 F5 a# I1 B
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
, s7 k, `+ C+ y+ d* ddesoxycorticosterone was 4.3 ng/dL (normal, 7 to
4 `+ Q5 R1 A3 }5 c6 W49ng/dL), 11-desoxycortisol (specific compound S)( e8 d! C+ F* Y: f
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
: w7 B% E8 e. m$ R! qtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total0 h2 ?8 K1 ^: [& B: |* p* Z
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
6 a3 X3 h; ?1 ]; R, j$ h! Rand β-human chorionic gonadotropin was less than7 G0 ~7 d; c/ z( Q6 F
5 mIU/mL (normal <5 mIU/mL). Serum follicular
+ p/ _+ O" d1 C. @% _stimulating hormone and leuteinizing hormone! x( ~4 S8 B! b' z! ]3 H' T0 m
concentrations were less than 0.05 mIU/mL
' q+ U( R1 M. O# ]1 ~(prepubertal).6 S5 E/ P0 c: V0 }" t
The parents were notified about the laboratory
& C- F* C! f8 Z5 W' V3 Y" |results and were informed that all of the tests were
5 Y. x1 |0 Q: L, M" c3 J6 Onormal except the testosterone level was high. The
4 q( Z& u3 o) V" g2 ^, n3 c$ Yfollow-up visit was arranged within a few weeks to
& F( M4 b- U7 i2 k4 _! qobtain testicular and abdominal sonograms; how-
9 ]8 L. n+ G$ e8 N( r. Never, the family did not return for 4 months.- w k/ |1 H) n
Physical examination at this time revealed that the6 ?* O+ U3 a5 Z! U4 x9 ?, c ~- k8 p2 [
child had grown 2.5 cm in 4 months and had gained! W5 w& C/ _, N' O
2 kg of weight. Physical examination remained
# ^3 ~. C7 \2 z: `. G1 x% }unchanged. Surprisingly, the pubic hair almost com-% m3 Z9 K5 r& g* f# u
pletely disappeared except for a few vellous hairs at- E( g4 I9 |# _; g& o& f- U
the base of the phallus. Testicular volume was still 2
! K% ?! U M1 t- umL, and the size of the penis remained unchanged.
" D* p: B" |: m& e# v# CThe mother also said that the boy was no longer hav- }: q( W2 q6 ^( l! ~) F' s' c
ing frequent erections.* B5 x1 t5 l6 p+ E
Both parents were again questioned about use of3 T* S, S. Z& ~
any ointment/creams that they may have applied to
; i" q3 i3 \9 e' E! Fthe child’s skin. This time the father admitted the( C$ u. ~0 F# N" p
Topical Testosterone Exposure / Bhowmick et al 5419 H+ V/ E/ L5 E( X6 G" w; K
use of testosterone gel twice daily that he was apply-* e+ ^; c( T6 g# d% D+ H
ing over his own shoulders, chest, and back area for( b, D8 z3 r+ _& V
a year. The father also revealed he was embarrassed! S) s' U' z. _6 t
to disclose that he was using a testosterone gel pre-
# u) G2 G. k# {% Dscribed by his family physician for decreased libido- ], g+ p* x/ i, X* T
secondary to depression.
2 Y: N- \# h( W! JThe child slept in the same bed with parents.
& e3 [7 V8 `4 Z! S* l. N* @3 YThe father would hug the baby and hold him on his8 C% {5 i9 G! U( r* Y: c: Q* L
chest for a considerable period of time, causing sig-
% y; I Q6 S3 ]nificant bare skin contact between baby and father.
! G1 |( X' `9 mThe father also admitted that after the phone call,
2 r$ L6 d( G }& Y. pwhen he learned the testosterone level in the baby
' p6 C7 P" z" O. B2 a2 U# awas high, he then read the product information9 [8 ^) R* ?* P4 w* k2 b$ {
packet and concluded that it was most likely the rea-# J3 Y! K1 x, l: }1 _) Z
son for the child’s virilization. At that time, they
& m. j0 f5 ]' Vdecided to put the baby in a separate bed, and the
4 v1 y* u9 @ U6 E6 Gfather was not hugging him with bare skin and had
1 G, a; v! X3 m8 b! dbeen using protective clothing. A repeat testosterone0 D! ]2 E; w! g5 a: }) J
test was ordered, but the family did not go to the" @+ U R& b6 j, P
laboratory to obtain the test.6 F/ ~9 [. G6 B
Discussion
, q2 f% }1 x, M8 N3 D' L) l- a9 LPrecocious puberty in boys is defined as secondary
+ s- x* d- z0 m* j$ Esexual development before 9 years of age.1,4
" U7 g) x! y4 N, K+ YPrecocious puberty is termed as central (true) when
% T( }/ M$ F" }% q) Tit is caused by the premature activation of hypo-
+ e J* `# X7 f9 m) _thalamic pituitary gonadal axis. CPP is more com-
! f/ |) P5 o7 p; L( K/ |mon in girls than in boys.1,3 Most boys with CPP
" F/ w# b& ^2 Rmay have a central nervous system lesion that is- z0 M& {0 M! @4 `
responsible for the early activation of the hypothal-
; Q5 s& ?; T: I+ V* ^amic pituitary gonadal axis.1-3 Thus, greater empha-6 j: l. r+ c/ Y* P7 B% k
sis has been given to neuroradiologic imaging in
w) C& E3 J8 e& `3 z5 S2 U! Tboys with precocious puberty. In addition to viril-
?2 K& V3 t: \6 A$ B9 jization, the clinical hallmark of CPP is the symmet-) ?* Z/ p# \: P$ G3 W( S$ l( P m
rical testicular growth secondary to stimulation by
- E- y5 c8 |$ D7 |gonadotropins.1,31 L3 D. L8 \* k2 P: h# S. ^
Gonadotropin-independent peripheral preco-
7 [0 }. O! L+ e8 gcious puberty in boys also results from inappropriate
& S- u$ u7 _1 V$ ~2 ?( s9 J @& {androgenic stimulation from either endogenous or% _9 `5 y. g5 S$ m& d2 ?
exogenous sources, nonpituitary gonadotropin stim-7 r$ e; Q! |. ]9 ?
ulation, and rare activating mutations.3 Virilizing
8 L& a4 D' _. J1 x! p7 F4 ?* h; Rcongenital adrenal hyperplasia producing excessive
/ B2 P" d& u$ O5 b, V: wadrenal androgens is a common cause of precocious
' ~: ~2 n: ~- G, e5 L9 a' Z: I ~puberty in boys.3,4
- @9 i: H6 } ], F# a1 {! p( [The most common form of congenital adrenal
. J5 O' L' L8 |# k0 D' t2 F3 zhyperplasia is the 21-hydroxylase enzyme deficiency.
3 R% c* q2 L3 _. m( o% E9 `The 11-β hydroxylase deficiency may also result in3 X! w! R, ~: D3 V: _4 V
excessive adrenal androgen production, and rarely,
# ^3 q& h3 I* H8 Can adrenal tumor may also cause adrenal androgen2 s" I$ P+ J, C, r4 E7 u
excess.1,3
7 {3 }% Y7 a! z }5 S! U" f7 r" Kat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from8 I2 v' W( f8 u& B! q, A4 R
542 Clinical Pediatrics / Vol. 46, No. 6, July 2007; C# {( Y- e* I0 W, J* ~ W2 v# m
A unique entity of male-limited gonadotropin-
2 W4 f$ l z2 i A7 Zindependent precocious puberty, which is also known& E! K9 s7 o+ H$ `+ N! ~
as testotoxicosis, may cause precocious puberty at a1 _" g8 v! i" m$ f% z- v2 h/ T
very young age. The physical findings in these boys
& H9 Q. S& y/ f6 J6 Ewith this disorder are full pubertal development,
9 E1 [4 x! g+ w* Qincluding bilateral testicular growth, similar to boys
4 |7 } M' d) ^with CPP. The gonadotropin levels in this disorder
6 e$ ?2 ~$ ~0 Mare suppressed to prepubertal levels and do not show
H* E4 ^; C: Gpubertal response of gonadotropin after gonadotropin-) u( O4 m/ a" a: p9 k2 d5 v
releasing hormone stimulation. This is a sex-linked
0 j6 ?+ S8 G+ v" Eautosomal dominant disorder that affects only# U' _+ C, ~/ ^* i4 U% ^0 L
males; therefore, other male members of the family
# ]4 g) L2 q2 P, ~& x, T6 F4 [may have similar precocious puberty.3
+ ^/ ]) K8 w( _. N1 p m+ KIn our patient, physical examination was incon-
& y" u: V' }2 d( G1 jsistent with true precocious puberty since his testi-, q' R% w2 q( J2 E/ K
cles were prepubertal in size. However, testotoxicosis
+ j: ?, U/ q, O3 x/ `was in the differential diagnosis because his father5 C$ U1 r) r% _: @& N1 L$ T3 {; W. p
started puberty somewhat early, and occasionally,* R0 y$ W# |) U1 Z1 ?
testicular enlargement is not that evident in the
9 u: w% w+ h( E2 e3 Z; Ubeginning of this process.1 In the absence of a neg-) W, O/ a/ q& P3 Z A/ @
ative initial history of androgen exposure, our: h. d! p$ J) E6 H. j+ S: L
biggest concern was virilizing adrenal hyperplasia,' R( G. T! ]& ]5 E
either 21-hydroxylase deficiency or 11-β hydroxylase- j) t' g# e& ~6 W( H
deficiency. Those diagnoses were excluded by find-2 j: r5 I7 ~" N; R$ s1 c
ing the normal level of adrenal steroids.$ r" b' ?( C, z+ p, X* E5 ?
The diagnosis of exogenous androgens was strongly/ Z- N( ~ k2 D0 n
suspected in a follow-up visit after 4 months because
( _( Y- ~) Q$ `' T, a: m6 {the physical examination revealed the complete disap-
, W6 e# ~/ K) w3 m; T8 g- H6 opearance of pubic hair, normal growth velocity, and
# M5 x( U) d p7 `decreased erections. The father admitted using a testos-
1 y& B" A; D5 Rterone gel, which he concealed at first visit. He was) k9 Q) }( M6 u& h: Y5 r3 |1 C
using it rather frequently, twice a day. The Physicians’5 s9 U1 f, W& F1 ?1 f1 Z9 H4 a
Desk Reference, or package insert of this product, gel or6 f L7 I/ a$ q3 e8 k9 ?
cream, cautions about dermal testosterone transfer to
& R7 l p0 j: dunprotected females through direct skin exposure., w0 B" \5 {/ F4 ?7 b+ x, `, O
Serum testosterone level was found to be 2 times the
/ K3 d: O/ \7 f' L, N6 U4 j8 [; z0 kbaseline value in those females who were exposed to1 G% i3 N8 |+ u/ n0 Z. T0 u1 i" a5 `! p
even 15 minutes of direct skin contact with their male1 l; L# y' o8 e* r/ B. j" d
partners.6 However, when a shirt covered the applica-* ~6 r$ k0 G1 }1 b
tion site, this testosterone transfer was prevented.2 Y) I5 [" Q4 `$ j* m
Our patient’s testosterone level was 60 ng/mL,
' e% n$ B' t2 v& U$ [# L0 P, iwhich was clearly high. Some studies suggest that: ^9 i- h' L ~
dermal conversion of testosterone to dihydrotestos-
3 i: A5 ~& ?* {terone, which is a more potent metabolite, is more
. a2 V1 q2 N6 K4 {/ @* aactive in young children exposed to testosterone7 U- n" d9 D' u
exogenously7; however, we did not measure a dihy-& F$ }, ^0 m/ Q2 @
drotestosterone level in our patient. In addition to
1 F$ p X# V6 D+ ^; I8 |2 f# bvirilization, exposure to exogenous testosterone in- w& z% w) g% b: ~7 O
children results in an increase in growth velocity and
% ]# H4 ^% }5 K ~! f$ M2 o9 F1 Jadvanced bone age, as seen in our patient.
! N& k4 }* s5 N" K8 d' yThe long-term effect of androgen exposure during
7 G$ \+ Q. T% X1 G9 nearly childhood on pubertal development and final
* j0 L* M7 H+ m4 Oadult height are not fully known and always remain
2 `: _5 b( j# \0 J: A# m! Ka concern. Children treated with short-term testos-
" G; y' G: k; o; l ~terone injection or topical androgen may exhibit some; {1 a2 Y3 \8 J; n* K; j
acceleration of the skeletal maturation; however, after
+ ?1 S/ C$ d9 I# W) Acessation of treatment, the rate of bone maturation
7 g: k n4 H: Ndecelerates and gradually returns to normal.8,91 s, M3 R1 t, O6 Y( Z" e3 D
There are conflicting reports and controversy$ ]4 A3 b& |; A& Y3 T' f
over the effect of early androgen exposure on adult
" n# B! C1 F' h, |) upenile length.10,11 Some reports suggest subnormal3 o. e2 @- o4 b1 b6 y
adult penile length, apparently because of downreg-5 {. b" \# y; C. c2 n' X( n) |
ulation of androgen receptor number.10,12 However,
: R9 l) T2 }2 J( L' n0 TSutherland et al13 did not find a correlation between
/ B5 c [9 ]0 k; Xchildhood testosterone exposure and reduced adult" c- r3 T# s- {* Q& S) O7 c; }
penile length in clinical studies., t& a! z" z/ A9 r
Nonetheless, we do not believe our patient is8 s' D! T v4 N3 r! h
going to experience any of the untoward effects from
" A R1 \1 V8 l- S8 V6 z8 c% u8 n* Htestosterone exposure as mentioned earlier because
P; R2 ~; v. k `the exposure was not for a prolonged period of time.( L! X; f( h, _+ f+ U: V4 n
Although the bone age was advanced at the time of
( V5 ?$ r9 `9 m/ t5 Y0 `8 fdiagnosis, the child had a normal growth velocity at5 }4 U6 J7 s/ Z" H" ~+ h
the follow-up visit. It is hoped that his final adult% }# W! G; Y5 ~: N
height will not be affected.
6 t+ @* {% ^# q) F! rAlthough rarely reported, the widespread avail-- u- H6 g+ u9 C) _$ q
ability of androgen products in our society may
0 T8 e; R* e/ P+ J+ N- j9 Uindeed cause more virilization in male or female
9 n7 I" E5 K8 Y- \, pchildren than one would realize. Exposure to andro-
u6 K; a$ H7 I- Ngen products must be considered and specific ques-5 l' M. H2 K* R# l. W5 W8 i
tioning about the use of a testosterone product or# ^0 I+ Q- @0 e9 a* |/ L
gel should be asked of the family members during
6 _2 p; d, u3 p9 Ethe evaluation of any children who present with vir-% ?& S8 F. p& X5 j7 Y O
ilization or peripheral precocious puberty. The diag-7 e6 j, u) O: w' m& T1 g9 S
nosis can be established by just a few tests and by
$ _' m' e, Z c" ?$ \7 _4 ]9 ~appropriate history. The inability to obtain such a: C, s! Y- I2 _; Z9 d4 h
history, or failure to ask the specific questions, may/ S1 ~0 n8 D: V; x1 s- V q6 W# S
result in extensive, unnecessary, and expensive& s1 F9 _. {7 P" J; S' b. U
investigation. The primary care physician should be/ f: {' f% ^" s; k) y# K
aware of this fact, because most of these children
5 }- ~& u* ? Y8 ~may initially present in their practice. The Physicians’
, m6 G6 ]& K/ X) K" oDesk Reference and package insert should also put a6 ~ j* L0 P( G+ y9 a0 q
warning about the virilizing effect on a male or; K4 ^7 l& [) h/ d. p0 L5 h
female child who might come in contact with some-
# d9 `8 A6 q8 ?6 q( _one using any of these products.! y* @* _* g* e0 L1 m, R
References
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?) ?& {# i& v, wEconomics Company, Inc; 2004:3239-3241.6 L" _& U- f2 U( t& \, ^' K
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testosterone and gonadotropin. J Urol. 1978;119:
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8. Guthrie RD, Smith DW, Graham CB. Testosterone! d A5 U% b, m. Q1 N+ g0 A: w
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